1/*
2 * Copyright (C) 1999-2002 Free Software Foundation, Inc.
3 * This file is part of the GNU LIBICONV Library.
4 *
5 * The GNU LIBICONV Library is free software; you can redistribute it
6 * and/or modify it under the terms of the GNU Library General Public
7 * License as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
9 *
10 * The GNU LIBICONV Library is distributed in the hope that it will be
11 * useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13 * Library General Public License for more details.
14 *
15 * You should have received a copy of the GNU Library General Public
16 * License along with the GNU LIBICONV Library; see the file COPYING.LIB.
17 * If not, write to the Free Software Foundation, Inc., 51 Franklin Street,
18 * Fifth Floor, Boston, MA 02110-1301, USA.
19 */
20
21/*
22 * C99
23 * This is ASCII with \uXXXX and \UXXXXXXXX escape sequences, denoting Unicode
24 * characters. See ISO/IEC 9899:1999, section 6.4.3.
25 * The treatment of control characters in the range U+0080..U+009F is not
26 * specified; we pass them through unmodified.
27 */
28
29static int
30c99_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
31{
32  unsigned char c;
33  ucs4_t wc;
34  int i;
35
36  c = s[0];
37  if (c < 0xa0) {
38    if (c != '\\') {
39      *pwc = c;
40      return 1;
41    }
42    if (n < 2)
43      return RET_TOOFEW(0);
44    c = s[1];
45    if (c == 'u') {
46      wc = 0;
47      for (i = 2; i < 6; i++) {
48        if (n <= i)
49          return RET_TOOFEW(0);
50        c = s[i];
51        if (c >= '0' && c <= '9')
52          c -= '0';
53        else if (c >= 'A' && c <= 'Z')
54          c -= 'A'-10;
55        else if (c >= 'a' && c <= 'z')
56          c -= 'a'-10;
57        else
58          goto simply_backslash;
59        wc |= (ucs4_t) c << (4 * (5-i));
60      }
61      if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
62          || wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
63        *pwc = wc;
64        return 6;
65      }
66    } else if (c == 'U') {
67      wc = 0;
68      for (i = 2; i < 10; i++) {
69        if (n <= i)
70          return RET_TOOFEW(0);
71        c = s[i];
72        if (c >= '0' && c <= '9')
73          c -= '0';
74        else if (c >= 'A' && c <= 'Z')
75          c -= 'A'-10;
76        else if (c >= 'a' && c <= 'z')
77          c -= 'a'-10;
78        else
79          goto simply_backslash;
80        wc |= (ucs4_t) c << (4 * (9-i));
81      }
82      if ((wc >= 0x00a0 && !(wc >= 0xd800 && wc < 0xe000))
83          || wc == 0x0024 || wc == 0x0040 || wc == 0x0060) {
84        *pwc = wc;
85        return 10;
86      }
87    } else
88      goto simply_backslash;
89  }
90  return RET_ILSEQ;
91simply_backslash:
92  *pwc = '\\';
93  return 1;
94}
95
96static int
97c99_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
98{
99  if (wc < 0xa0) {
100    *r = wc;
101    return 1;
102  } else {
103    int result;
104    unsigned char u;
105    if (wc < 0x10000) {
106      result = 6;
107      u = 'u';
108    } else {
109      result = 10;
110      u = 'U';
111    }
112    if (n >= result) {
113      int count;
114      r[0] = '\\';
115      r[1] = u;
116      r += 2;
117      for (count = result-3; count >= 0; count--) {
118        unsigned int i = (wc >> (4*count)) & 0x0f;
119        *r++ = (i < 10 ? '0'+i : 'a'-10+i);
120      }
121      return result;
122    } else
123      return RET_TOOSMALL;
124  }
125}
126